List, in order of decreasing altitude, the principle layers of earth’s atmosphere.

explained

Explanation:

the levels of atmosphere in the order of decreasing altitude, can be listed as follows

1. Thermosphere : altitude extends from 80 to 120 Kilometers from earth surface

2. Mesosphere: altitude extends from 50 to 80  Kilometers

3. Stratosphere: altitude extends from 18 km to 50 Kilometers

4. Troposphere: altitude extends from 0 to 18 Kilometers

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find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle